Steam or pneumatic engine



(No Model.) l G. B. KING.

STEAM 0R PNEUMA'I'TGBNGINE.

N-0.'55-0,324. v Patented NOV. 26, 1895.

. 14%5e% yw SFECIFIQATION forming part of Letters Patent No. 550,324, dated iiii Griginal application filed May 22, 1894, Serial No. 512,037. Divided and this application'filedPehr-gary; 539,099. (No model.)

To all whom it may concern:

Be it known that I, CHARLES B. KING, a citizen of the United States, residing at- Detroit, in the county of Wayne and Stateof Michigan, have invented certain new and useful Improvements in Impact-Engines, of

which the following is a specification, refer-' ence being had therein to the accompanying drawings.

The invention consists in the construction of a steam or pneumatic engine, usually 7 known commercially as a pneumatic tool.

The invention hereindesoribed is divided outof my application, Serial No. 512,037, filed May 22, 1894;; and it consists in the construction of the controlling-valve for the motive agent, particularly in th 3 construction of that valve and its combination with a handle for the engine, so that in forcing the engine to its work the valve is opened, and when the engine is withdrawn from its work the engine is stop ed. This valve is shown applied to the g'haust of the engine, to which .it can be applied as well as to the supply.

The valve maybe applied to any form of engine of this type-such, for instance, as the construction shown in my previous patent, No. 513,941, of January 30, 189-t-or to a socalled val'veless engine, as shown in my previously-mentioned application.

As the engine itself or the hammer and its ports and passages is no part of my present invention, I do not deem it necessary to illustrate the same.

In the drawings, Figure 1 is a side elevation of an impact-engine embodying my invention and showing in dotted lines the piston or hammer. Fig. 2 is alongitndinal section through the top of the tool, illustrating The end cap or head of: :theaoohE,

o l limit ...oo mil .1 iii has notes;

ra e

eis an air-inlet passagzdonisnpphyiingtand to reciprocate the piston B. .viqgne its eat 9 is an exhaust-passageifiroiirftneicyii'fidt 11 these ports being so combined andiarsatn gc r1551:

ports or passages as to reeipr'oatetheepistono when the air is snp'pliede tnr-ttdrrecnl indedi through the supply-ports means": valve is open.

shown provided with a centralshort or change ber G, in which slidingly eirgajgesithistelin-(ieni the end motion of whiehtis'zliihitedkhgnars-i'zgtli G secured in the endiicaip oairdiapassiirgiog, through a groove or cut+awayiipontioriifi .taf 0,3 the stem, as shown in Figs;- 2iand1i6:e nah-gen stem is preferably formed;aintegralewitlnethes shaft I, on the end of".jwhi'c-litz;El ssa-11.; armqoim knee-plate I. This shaftgfornis aihaudieabywc means of which the tool mayherheldiupatogitss work. Through this stem is formedth'e port- J, adapted to be registered with the exitport J in the body or head and the exhaustpassage J 2 from the cylinder in its inner position. The end of this stem forms a piston under which air is admitted from the supplypassage through the port K, Fig. 2, and thus acts when the pressure is on to normally hold the stem in its 'outermost'position, as shown in Fig. 6, to close the exhaust and thusstop the piston.' I

To preventleakage around the stem through the exhaust, I preferably form a check-valve for this port by fittingin a notch in the stem a complementary block L, fitting across the art J. A groove J 3 around the, stem at s point admits the air under pressure from the exhaust-passage J 3 to the flat rear face of the block, and thus seats the valve by pressure when the stem is moved to its outer position; (Shown in Fig. 6.) The exhaust-passage J 2 is connected with the cylinder by the Po 9- The parts being thus constructed and ar- 5 ranged, the operation is as follows: The stem G will be held out in the position shown in Fig. 6 by the air-pressure entering through the port K when the tool is not in use. In this position of the arts the exhaust-passage I00 will be closed by t e valve L, as described. To start the device, the bit-D is held. against the Work and pressure applied to the handle or. shaitfI, which will force in the stem G against ethje air-pressure until the exhaustport 1s opened, as shown in Fig. 5, when the engine Wlll'lJG started and the piston will continue to reciprocate, striking upon the hit or chisel in the Well-known manner.

, -v What I claim as my invention is- 1. The combination wit-lithe cylinder, the piston and the supply and exhaust ports, of a shaft for holding the tool to its work, a stem on the end of the shaft havinga port therethrough, adapted to register with the exhaust port, Working in. a cylinder or bore in the end of -the cylinder or head, and a port connectingrthe-in'ner end of this bore or cylinderwith the air supply, i

2. 'The combination with the cylinder, the

piston and the supply and exhaust-ports, of

a shaft for holding-the tool to its Work, astem on the end of the shaft having a port there through, adapted to register with the exhaust port, working in a cylinder orbore in the end of the cylinder or head, a port connecting the inner end of this bore or cylinder with the air supply, a flattened portion onthe stem having shoulders at' the ends and a screw passing through such flattened portion and acting as a'"'stop to limit theinotion of the stem.

3. The combination with the cylinder having an exhaust port, a stem Worlcingin a boreacross the exhaust-port and having a port adapted to register'with the port in the shell or body, and having an imperforate portion adapted to be moved across said port, of a .valve block termed of a complementary section of the-steinand the groove J around the stembehind tli "alvedalock.

4. The combinatiomwith the cylinder, the exhaust port, a tem working in a bore across the 'exhaust port 'd having an exhaust opening "adapted to register with the port in the shell or body, and an imperforate portion adapted to close the exhaust port, substantially as described, 5. The combination of the body, the exhaust port, the stem G, the block L and the groove J around the stem behind the block, substantially as described.

6 In a pneumatic tool, the combination with the cylinder piston and the supply and exhaust ports therefor, of a tool support at one end, a tool therein, a movable shaft for holding the tool to itswork and a valvecontrolling the piston actuated by the holding means, substantially as described.

7. In a pneumatic tool, a valve controlling the motive agent,,a cylinder in whieh said valve'works, a'port for supplying the motive agent to said cylinder to hold said valve nor' 

